A widow is covered with colored powder during a March 3 Holi celebration at the Meera Sahabhagini Widow Ashram in Vrindavan, India. Shunned by society when their husbands die, the widows celebrated the Hindu festival of colors at the ashram, which funds most of their needs. Bernat Armangue, AP

A man attends a farewell ceremony for slain opposition activist Boris Nemtsov at the Sakharov Center in Moscow. Nemtsov, a strong critic of Russian President Vladimir Putin, was gunned down near the Kremlin on Feb. 27. Dmitry Lovetsky, AP

Protesters hold portraits of some missing Mexican students during a demonstration against Mexican President Enrique Pena Nieto, who began a three-day state visit, outside Downing Street in London. Nieto's government has faced international outrage and regular protests over the disappearance and alleged slaughter of 43 college students at the hands of a police-backed gang in September 2014. Jack Taylor, AFP/Getty Images

Palestinian militants from the Islamic Jihad's Al-Quds Brigades squat in a tunnel used for storing weapons during a training exercise in the Gaza Strip. Mahmud Hams, AFP/Getty Images

A worker sets up a giant television screen before a presentation by the Italian carmaker Ferrari at the Geneva Car Show in Switzerland. Fabrice Coffrini, AFP/Getty Images

The Villarrica volcano erupts near Santiago, Chile. Three thousand people living in villages near the volcano were evacuated. Carlos Rocuant, AFP/Getty Images

Thousands of couples from around the world participate in a mass wedding ceremony at the Cheong Shim Peace World Center in Gapyeong, South Korea. Couples from more than 50 countries exchanged or reaffirmed marriage vows in a ceremony sponsored by the Unification Church. Ahn Young-joon, AP

A security officer stands near a burning pile of elephant ivory at Nairobi National Park in Kenya. Fifteen tons of confiscated ivory were destroyed. Carl De Souza, AFP/Getty Images

A military band conductor runs through a rehearsal before the opening session of the Chinese People's Political Consultative Conference at the Great Hall of the People in Beijing. Feng Li, Getty Images